guy I'm seeing is always online on whatsapp, does he have someone else?

So the thing is that at first he used to talk with me all the time, but now I see him online all the time but he doesn't talk to me.. I'm just wondering if he has some girl who he's talking to... He's literally online all the time.. Do guys even text each other? cause I don't because he has a player's reputation so I'm just worried.. But one thing he does is if I'm online on whatsapp after I said goodnight he'll text me asking why am I not sleeping.. Help anyone?